Segmentation fault fix

src/fdialog.cpp

@@ -42,18 +42,20 @@ FDialog::FDialog (const FString& txt, FWidget* parent)
 //----------------------------------------------------------------------
 FDialog::~FDialog()  // destructor
 {
-  FApplication* fapp;
+  FApplication* fapp = static_cast<FApplication*>(getRootWidget());
-
+  bool is_quit = fapp->isQuit();
   delete dialog_menu;
   dgl_menuitem = 0;
   delete accelerator_list;
   accelerator_list = 0;
-  activatePrevWindow();
+
+  if ( ! is_quit )
+    switchToPrevWindow();
+
   delWindow(this);
   delDialog(this);
-  fapp = static_cast<FApplication*>(getRootWidget());
 
-  if ( ! fapp->quit_now )
+  if ( ! is_quit )
   {
     const FRect& geometry = getGeometryGlobalShadow();
     restoreVTerm (geometry);

src/fmenu.cpp

@@ -69,7 +69,11 @@ FMenu::FMenu (const char* txt, FWidget* parent)
 //----------------------------------------------------------------------
 FMenu::~FMenu()
 {
-  activatePrevWindow();
+  FApplication* fapp = static_cast<FApplication*>(getRootWidget());
+
+  if ( ! fapp->isQuit() )
+    switchToPrevWindow();
+
   delWindow(this);
 
   const FRect& geometry = getGeometryGlobalShadow();

src/fstatusbar.cpp

@@ -177,6 +177,7 @@ FStatusBar::~FStatusBar()
       iter = keylist.erase(iter);
     }
   }
+  setStatusBar(0);
 }
 
 

src/fwidget.cpp

@@ -537,7 +537,7 @@ void FWidget::setStatusBar (FStatusBar* sbar)
   if ( ! sbar || statusbar == sbar )
     return;
 
-  if ( statusbar )
+  if ( statusbar && sbar != 0 )
     delete statusbar;
 
   statusbar = sbar;